6. Noosa River DMP Ver0 (Combined)

                                      Requesting Endorsement of Sediment Sampling and Analysis Plan
                                            BMT (OFFICIAL)



Adverse Weather
The planning of field sampling will involve regular checking of available weather forecast services for
the study area. There are no unusual hazards in operating the corer in wet weather.

In case of adverse weather conditions that would make sampling unacceptable due to strong winds and
high waves, the sampling team and vessel operator would remain on stand-by until weather conditions
improve to allow rigorous and safe collection of sediment samples.

Equipment Failure
The grab, corer, and lifting arrangement will be sufficiently robust to afford good operation and no
failure of the equipment is expected to occur during the sampling. Prior to sampling, all equipment will
be thoroughly checked and repaired if necessary. A secondary GPS, multiple spare core barrels, and
tools to fix minor problems with coring equipment will be taken on the vessel in the event of gear failure.

In the unlikely event of equipment failure during sampling, repairs to any equipment would be
undertaken as soon as possible to minimise delays as far as practical. The site is located near Noosa, a
major regional centre, where replacement equipment (including an alternate vessel) could be sourced if
required.

3.8 Contaminants List
The contaminant list is to be based on a review of catchment land uses, geology and existing
contaminant data. The catchment does not contain major pollution sources (e.g. industrial uses, large
urban areas), however there are too few existing data to develop a robust contaminant list. Therefore,
a conservative approach has been applied to ensure a broad suite of parameters are assessed
including metals/metalloids, various organic compounds and acid sulfate soils (Table 3.3).

For the Spit sites it is proposed that a pilot study (20% of sites) be undertaken on hydrocarbons,
pesticides and emerging contaminants such as PFAS for Horizon 1 (0.0m to 0.5m). If concentrations
are detected for these parameters, remaining samples for Horizon 1 and Horizon 2 (0.5m to 1m) will be
analysed (for those parameters detected). Horizon 3 (>1.0m) will be sampled for basic characteristics
only as per Table 3.3.

For the River sites it sites proposed that a pilot study (50% of sites) be undertaken on hydrocarbons,
pesticides and emerging contaminants such as PFAS for Horizon 1 (0.0m to 0.5m). If concentrations
are detected for these parameters, remaining samples for Horizon 1 and Horizon 2 (0.5m to 1m) will be
analysed (for those parameters detected). Horizon 3 (>1.0m) will be sampled for basic characteristics
only as per as per Table 3.3. Sampling effort has been increased from 20% to 50% of sites to
conservatively increase the number of sites beyond recommendations in the NAGD 2009. Additional
characterisation sites will be tested for basic characteristics and acid sulfate soils (ASS) only as per
Table 3.3.

Laboratory testing of ASS will also be conducted on samples taken at 0.5m intervals along the full
length of the retained core as described in Table 3.2.

Because all dredge material is intended for placement up to and above HAT, a tier 1 assessment will be
conducted as per NEPM. Contaminant screening levels are based firstly on the NEPM for public open
space (HIL C). Screening levels based on NAGD (2009) and subsequent updates to it (Simpson et al.,
2013) have also been included.




A10342 | 002                                        22                                    15 November 2021